Tell SearchWP to index both value and label from ACF Select field

searchwp-customizations.php

<?php

// Tell SearchWP to index both value and label from ACF Select field.
add_filter( 'searchwp\source\post\attributes\meta', function( $meta_value, $args ) {
	$acf_field_name = 'state'; // ACF Select field name.

	if ( $acf_field_name !== substr( $args['meta_key'], strlen( $args['meta_key'] ) - strlen( $acf_field_name ) ) ) {
		return $meta_value;
	}

	if ( ! is_array( $meta_value ) ) {
		$meta_value = [ $meta_value ];
	}

	$acf_field_object = get_field_object( $acf_field_name, $args['post_id'] );

	// Append the Select label to the Select value.
	if ( isset( $acf_field_object['choices'] ) ) {
		foreach ( $meta_value as $key => $val ) {
			if ( isset( $acf_field_object['choices'][ $val ] ) ) {
				$meta_value[ $key ] .= ' ' . (string) $acf_field_object['choices'][ $val ];
			}
		}
	}

	return $meta_value;
}, 20, 2 );

Thanks for this awesome plugins and also code snippets.
Is there anyway to provide us for indexing gallery field custom fields?
I mean, as you may know ACF returns gallery field as an array, actually nested array including all the gallery items.
What I'm trying to do is to index each image title for search engine.
is there anyway you can help me with it?